"""
Regression test: Ensure app-level responses with Union models and content/examples
don't accumulate duplicate $ref entries in anyOf arrays.
See https://github.com/fastapi/fastapi/pull/14463
"""

from typing import Union

from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel


class ModelA(BaseModel):
    a: str


class ModelB(BaseModel):
    b: str


app = FastAPI(
    responses={
        500: {
            "model": Union[ModelA, ModelB],
            "content": {"application/json": {"examples": {"Case A": {"value": "a"}}}},
        }
    }
)


@app.get("/route1")
async def route1():
    pass # pragma: no cover


@app.get("/route2")
async def route2():
    pass # pragma: no cover


client = TestClient(app)


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/route1": {
                "get": {
                    "summary": "Route1",
                    "operationId": "route1_route1_get",
                    "responses": {
                        "200": {
                            "description": "Successful Response",
                            "content": {"application/json": {"schema": {}}},
                        },
                        "500": {
                            "description": "Internal Server Error",
                            "content": {
                                "application/json": {
                                    "schema": {
                                        "anyOf": [
                                            {"$ref": "#/components/schemas/ModelA"},
                                            {"$ref": "#/components/schemas/ModelB"},
                                        ],
                                        "title": "Response 500 Route1 Route1 Get",
                                    },
                                    "examples": {"Case A": {"value": "a"}},
                                }
                            },
                        },
                    },
                }
            },
            "/route2": {
                "get": {
                    "summary": "Route2",
                    "operationId": "route2_route2_get",
                    "responses": {
                        "200": {
                            "description": "Successful Response",
                            "content": {"application/json": {"schema": {}}},
                        },
                        "500": {
                            "description": "Internal Server Error",
                            "content": {
                                "application/json": {
                                    "schema": {
                                        "anyOf": [
                                            {"$ref": "#/components/schemas/ModelA"},
                                            {"$ref": "#/components/schemas/ModelB"},
                                        ],
                                        "title": "Response 500 Route2 Route2 Get",
                                    },
                                    "examples": {"Case A": {"value": "a"}},
                                }
                            },
                        },
                    },
                }
            },
        },
        "components": {
            "schemas": {
                "ModelA": {
                    "properties": {"a": {"type": "string", "title": "A"}},
                    "type": "object",
                    "required": ["a"],
                    "title": "ModelA",
                },
                "ModelB": {
                    "properties": {"b": {"type": "string", "title": "B"}},
                    "type": "object",
                    "required": ["b"],
                    "title": "ModelB",
                },
            }
        },
    }